Once the signals are cleared there's very little the crossing operator can do and the emergency services are trained well enough to sit and wait...they don't even sit there with their sirens going off.
Indeed, Red Lights at crossings are Mandatory Stop for all emergency services ***, no if's no but's, if it is a manned crossing and the train is in a station or close by, then there will be the normal 4 min timer on the protecting signal anyway, so it's just as quick to wait, if the barriers have just been lowered and signal yet to clear, then he can raise the barriers again, if there is a delay however, it will, and does go down an a signaller delay (OC)
*** = well, its Mandatory stop for
EVERYONE, but many seem to find this so very hard to understand !
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Are the barriers interlocked with the track circuits to prevent the "barriers raising sequence" from happening if there's a train occupying the covering track circuit or the track circuits either side of the crossing?
Yes, which is why when there is a track circuit failure over a CCTV / AHB crossing, the barriers will be locked down, until either the S&T fix the fault, or an attendant gets there to put them on 'local control' this can of course take some considerable time if the S&T are miles away on another job, and the MOM has to get there from a distant location too, there is nothing a Signaller can do to chnage things, at AHB's if they have failed, (for whatever reason) the Signaller cannot permit you to go over the crossing, likewise if a Police Officer is on site, he cannot allow you to cross either.